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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '81261b9815352d22f9bd2e86b4481a8e28575e0472beef33587dff5bcc65533c' 
  AND token = 'W7uLRA527iB9rKYC14n0QFo8VKiR/z/VZQzQaJetobU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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