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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4855739d188b4792c532c7952b56068ce4206b9ebe98530af4974cb635ade249' 
  AND token = 'j/yh7kxZ2MyeePdEAyXeeMWYxG0IOKsVozRf/3AT04o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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