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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '58d0545655f23221eefe0a334ee3fe5ed099a47c1853c22717348479e731e3c5' 
  AND token = 'pIhIrBilnX2/IQHl9e577JxYU5ptg6atwNhwP246h9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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