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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd46eb7b01de25e4102cc088ef9681e062107440a5e3be76a27706b600abce893' 
  AND token = 'OcMCgy5vZM10VMh4XxFJ6t0M/GYcRdBFFJnZkoaSiaw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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