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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0a256752873ce7454a4aca27055601f31d38f0a274436ea37a6ea80c47c7adfd' 
  AND token = 'wvn03CLZWEVQNwsxE0J07vLs5wpAwpNl7hiLoOYrmLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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