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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5e3538796033219d12e2b90b098cea74ed96df3cbe56237ac42113f2de114088' 
  AND token = '4IjwbL4kHWDbyPPffZlekB4K5qLEqddEnnV92M4bO6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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