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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0a975af9e00467d5c541e01619228e5b4df43bdf07525d291c16b1ecab8a82d0' 
  AND token = 'idWsd1eNIrmWkIeOzFGUy3zpQgcxWBTdfIg9dEQoY0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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