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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '751359de3dd126a010daee6e91c758e1e3a3bd55034f2009dfad4834e50d4a50' 
  AND token = 'KRR3idFSC3BjoBK6gnh3ckk7Vg0sTq6g+TXDTvMWNI8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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