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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cd0f364cc2fdc2c39d02ee76d4420ee4772f5670de3ca3a38c793d2084383e6d' 
  AND token = 'hAE7K9LICrfq42aHBmn7SbvhytOM8DtpNXKk6C+D8n0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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