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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3d5e95bfd6282436ec041ca2713246bd047dd76a1640d692bab426d13f627431' 
  AND token = 'yPeWdlUMaqvPP5yGQCawH6bSriOMSkz8e7LBh1TpCVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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