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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '45c534279c69f0dae6bd861f991a645f5a10cc3aeed56118de62f0e12cf12a87' 
  AND token = '21C1/Ni59Ol60riw75Q/phOpKSOPU2+pKMcrQ5DW/4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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