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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7c439274473277639b0873fea96c7df42a9020d779d23d902cd1f25806909638' 
  AND token = 'mLYg2SmWyqbXMmE/9X969iRFYawCVtlVIrqa+i+X2ME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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