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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b7c7c4904393d40b7a5eb95f6fa821698117edf76705c04acca2895e35a560a5' 
  AND token = 'en7ngOIgA1qiKC8dcQ6tIH2DYOhjKIodxNB/nJieLKI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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