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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '770cf09a0b4983a1f0b1c68d917a6457f06ab70ca36475beddd276379f072c16' 
  AND token = 'JAnjnIpOMgfbJ7lLeoTLBRLlsDbHLP86bqH1dhYcjLc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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