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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '660a0f2d7b9315569c837b1019fe4dc204d2dd566ff422f5c9e2c33ed122f234' 
  AND token = 'CHbh50DN8CRfnT/aKieakluTlnyuHnMV1yMet7XSulU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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