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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '097c61a851144e146563b72b7339599b7bcfb439893d49742013c3634385ba61' 
  AND token = 'Efw/W5jdAuICqOI0gprROftuy4TT0ey8ykUOElUnl6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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