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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3d0a3f43a1b4b79445643d3881e43ce0b30bc9beb86030bf7855fb5a09a40370' 
  AND token = '2eHEynMxk5NX2RCutPpLXplDUe7hm+KSm/ziGm1r+k0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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