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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cedb9806bce077181d1d10db4d44bf76a0267b0d911f72cd6f14e54ce032e053' 
  AND token = 'wGoI8jRpbq+GClQioILjax5X6ohxN18Ol3oRyfbmdmM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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