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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '01477b804b9e12f27967c4e52f03c0abf04e3a846b41952767f2e1d1f8d93b48' 
  AND token = 'Vx1uCVD5Jyy9DL/IigCzid22Wzp980RgSx3LfNeFiBE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00070

JSON explain

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