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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '77d7135b0f2a49fbeaf5213adff529e043b677c8138c8edc9be9c02557b2c534' 
  AND token = '4dkLp1cr9C9qy6KSsgkQzK0JutiTO6E0NFQYIiARZpo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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