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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '31f7a1ed92bcfde95eb491d7c6f9df26652253a9de3b7fa382a9d6d80fbee1b2' 
  AND token = 'Dt6FILLOILloKQNU9ZryseNnU47R4I/YO9DohxPKNUY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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