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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '87eda84683c6595fe5c450d640904c6c6f585662c95cf944ee1ecb03f2da68ea' 
  AND token = '1KXMzzR482djCT54+MtMu9iuJE1Jlo9HIFrI6T2BN84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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