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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '37905534c23f77732c56cb4cd7988f5e29745b934cc72aa7b5fa036c1476f291' 
  AND token = 'qd17TvA/FBrCV2gME3cogCTjjp2buq7btE9Sn+maUjc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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