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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'beefead5ceeb263a39c25c086bdb65a094b64bdc30b539cd80e278b15696efcf' 
  AND token = 'QClPUBRC54QWQxzMz3EO3J5p1X17ccuOABwyr6K9RvI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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