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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '26facf49a886706bbf3f0fc9e2a469ec7066fb2f9616025a1d0f40c08449af67' 
  AND token = 'Sym/hSlk1/W3w3BnCUbOymMYOCEO0bm+WOnZgafZH0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}