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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5fa41688f113474c43d57562677ae7bd52c442eacbdee7ff2c8969554780e216' 
  AND token = 'RincPiPLNwnY7NAvvFkFY3NbtUl4EMhVO62di5RjYp0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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