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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dfd75f7e1a32ddf150a27b52c0224611c9fc3ca719034399a4d6b9c6e36107ab' 
  AND token = '4RaCRj0LhsyYIh0MdaFFGoXVIx7qfK5GgF1MHFVW0bc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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