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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ea3f6f7fa6a51dfcb4e2e1099eab618a09479f7983c16ace3ac614c4247a743a' 
  AND token = 'wZAwR9nEqrqpI5/ak0D5ZZTm15AIMeDoi/wrHJSuAp8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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