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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '40ba163f8d6d5830dc3b6b29be8e827ef2635ee8f193e100c5b34eacdbe366b4' 
  AND token = 'I6w5vJM7AuvyqMKT21kQzLkEfsc/LYrJlIXJx7BpX9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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