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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0382c43a78f0ffecaca86e484d4e332c7995fc86151f4408f4d09c0ce92909f2' 
  AND token = 'RwhN0K+VR3c/yQnz7xTAxzjBz0dlyCenG5QRMioGsqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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