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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6fc875c34ecf2697dcf343a99298ba1508d0aeac0ff00f628aaf33f43fd9e5a4' 
  AND token = 'GKeYF++r8cyDdS+QKxqMaFaM1fFT0E849qSqU6m+2ag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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