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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '16686fe348fd2f11565a998dddb64b07a4e908e42b0a5147e955c8432ed844fd' 
  AND token = 'l6tPLBH2hswX2ch8dsMukdMAnwQ115dorWiIFYTNr48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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