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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '01c6ea16465b72267064d85ed82ea102a8cb6cb9ddaf47d0770e6bd4f5e82dd1' 
  AND token = 'uKU1GAWk5IttZyZoIvwmzsMbrcQOK6h1/7/c06AW3yc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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