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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4a3a801de4a4dd50f6ae7b1812d0347349cf8392fead8ed6fe45fc8a26041092' 
  AND token = 'j1t5ggc6ftofnerrR9pbmEhbR8dA6f+5W+bNkmXcBFc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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