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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e20f79618e6a1f01d50e74e368104b61c862dd6a5cf6a03cd1ed693496b909cc' 
  AND token = '5QZQ3eJZf9DzXz8jlbs+wPJFCy+Vn7cBV7acTIGTcNE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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