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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f50a2c3dd40ea9f9c2783d26bcc0baa4981552e2ac87ec9291e6eb336712ecc5' 
  AND token = '00Uxaf7pPNWlUo/yPa2gUlSIFM9ehdF/H8PdfNt80bw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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