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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5fec180cca1aeb4592702324f0cdd9ea1e4eece656a9f25d7b51ecf350d5a5ad' 
  AND token = 'NC17DeqBye+Z71wgSt1YNoOEuge2DRBcQ8xf4ZAldEQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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