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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3dba87ae95061878fbc0b1e9b9a774a8c8cd9694051bc6047beeb035b6754f5d' 
  AND token = '+A3ET2RXCgVajxBwjfLSSlSwxu3cRNKuLX63dzB0hlM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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