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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0abfee3c4e71da93a950673e0a1e9a8989c512449f79f07922c2638f5f3ae823' 
  AND token = 'PUH+vEvvd0hulno8H6sjG8TlpOvul5VsOli1fEfF7W8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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