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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4b661f4c59c77a6506ee977c30769cecfe3fb5236de08119b31320e7893e0bed' 
  AND token = 'lCQ25nN3iypM6M1qGswZT7/xSYXbsE5tqCCIgtCaXZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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