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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7927eeda859e191cbfe49cbe857c3bcd083f72fa21e1fdf6cd655d1a4e508bc5' 
  AND token = 'wPCbY1Kxb4hEeONR88dtv8IEccpGoBoPtpXcK3SmLgo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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