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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c021b3938ec44c3da21c5738658d022bf75dd74237fd3ba1fef23c5e883fed64' 
  AND token = 'dlkxiwO6yddVv3BAnbJe5wn1pI+/G4/kb2y9EQSHiVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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