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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b66202d1561693eaacd48729a52ddf97cd50183795b28967941bf2f6765c8bdd' 
  AND token = 'ojlv8y5kG2ezo0K7fyny8nruOm86+FuTatrPJLWnn+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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