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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fe78375d2875bcd5b9a4a9719bd06d7184ff3c2dc66ba04ff9549effaa9722bb' 
  AND token = 'L/uVl/5kpj+NkPs/SitVILF5D9x8/kCX+GLbosuW6x8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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