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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1d62e40e55cd2b91204ca6751874a802dd20738da8aadd976ea5539cb1a02f45' 
  AND token = 'i/yohct4LbAN1Ul/sFSizJGm3uGiy5Q474oiotEDhYQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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