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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6021bdebacb1e1a3e55ed2a9f29b7f70105335c3cf7fd86199355f2259dba934' 
  AND token = '1MId0MTQe8sOk6tobdPuRKPYB+ugo0Qun0t6c3SbH/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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