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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '637893ad372ba9a18fd1e714c9c80071b1aa1c67be5d7565f9ece5d076d172fb' 
  AND token = 'ADk4DVn+pddVvpe1x2F1pTJ7XBAsXbT+Orq0Acmv6CI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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