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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4a11e8c4442da26f4b350ff7132fbcd1486ece584c36fcb2e08ac8c79b475d15' 
  AND token = 'hm4F7ugvEcGLe5NDzppv8Ut1iU3/Oc8YeOQvmPX3ObE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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