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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '54d0a8697293f96c929ce602204e288c648ede814da733fa515b24d4323d0c8f' 
  AND token = 'JMU8p6X2OOkrK6A6BOX2jwam9aE65b6fLeYnbs3dACs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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