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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c0bb587e48d71c91bb876f660f9245e07b064fac9a5de592f41339c3434bbeb0' 
  AND token = 'wIR5xWWZQeD+vpE+MIf1DC74KUNjUoXN+Eg91M3vNYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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