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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '11de3b039972ce0a7e7e2c68471a1a76b6f0617582b2d730bfd9f8b8d2039c65' 
  AND token = 'CTX24BPSA5xjraG4QEItIlLnZZ603D79Lt6fzP/CnbI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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