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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6e832f26492667b7d00fe9c21d03a90d5f49f9f594fe7da120075ce7f39eaac8' 
  AND token = '9mk2zs/uABcSu4FKL2Sbb7SF04Iqg+i+G2bidzIpePM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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