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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e278fc27862832264f3df7da42a7343fca22f21046e435bfe45a9ef25d77eb62' 
  AND token = 'RBcmjklcfiYjPFPldWs3myBYc4r7BS9J2H4omEOhZc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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