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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '204207d36e75ca17a58d22afbbbada234e57eee726be4f0322c83a82856699c2' 
  AND token = 'N2oSMFphRj4wigvSuSvNzSpaxN8z2gA0EFTZ5CHeONY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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