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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '73fabcd4f86550b96d8dfaf9169f21dd804bd9d8279b65c6395f8d95dffb61d9' 
  AND token = 'dWMl4ly6MPNgQIisBDH7WKKui/Ee1x0Y1OAheT9pp6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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