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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '67364d3322ea1b37f2adef7a17b4be75cd39ddfe90943216a29074122bc77c26' 
  AND token = '0xIezL5+6+dzHs+9D4wS3zO0xWlhQBEUeigM9wVopZ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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