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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd7056a03d13d7469c3da8a13e8fa76cc6c31bf7a5a559f77ee87b6559a4b28d4' 
  AND token = 'V7Ka8AZujFAMiHdzf5ddvSBaPRJ1ejHy4I8cY5+x2NE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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