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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '83cd398bb3466abd913ce7a0dd8a4e1e479fac71b10c120b6ac8470a31d7aeae' 
  AND token = '7fC0IMeBDbcbxepojwMu7kMkT42L+cscnOx87gYtk6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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