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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '167612552b59a9f138683254a49be374d595eef5ac4c3ef4c0de0ad3129db62a' 
  AND token = 'F+blKhD1dDumbpRvTAr5n9m6JHuQvFBZt3E559xJ3fk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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