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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b0499355284fd2bac4caa6c206d82c072a4decc3172c3a4702bf4f9ef6676f06' 
  AND token = '/j9Npckg2vNhESVyrKzibxnatYlAZWKKfRMCzRS4GcY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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